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Answer Wiki. The ionic charge of oxygen is -2. You can tell because oxygen is in group number 6, so it has 6 valence electrons. Since it needs 2 more electrons to become neutral with a full outer shell of 8 electrons, its charge is -2 (since adding electrons gives a negative charge).
Potassium (K) has a charge of +1 while Oxygen (O) has a charge of -2. Written out: K+1 O-2 You have to use the criss cross method as this is an ionic compound. This process will turn the negatives into positives. Therefore it will look like K2O1 or just K2O Hope this helps!